This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A309028 #21 Jul 16 2019 02:51:22 %S A309028 1,3,14,323,1918,195843 %N A309028 Smallest k>0 such that the elliptic curve y^2 = x^3 + k*x has rank n, if k exists. %C A309028 See A309029 for the smallest negative k. %H A309028 B. J. Birch and H. P. F. Swinnerton-Dyer, <a href="https://eudml.org/doc/150565">Notes on elliptic curves, I</a>, J. Reine Angew. Math., 212 (1963), 7-25. %Y A309028 Cf. A031507, A060953, A194687, A309029. %Y A309028 Cf. A002158, A002159, A076329, A309030, A309031, A309190. %K A309028 nonn,more,hard %O A309028 0,2 %A A309028 _Seiichi Manyama_, Jul 08 2019 %E A309028 a(5) from _Vaclav Kotesovec_, Jul 14 2019